[oss] Talk by Alex Calotoiu - "Using Automated Performance Modeling to Find Scalability Bugs in Complex Codes", Monday, 21st of October 2013, 7pm

[Razvan Deaconescu]

Hi, everyone!

It give me to pleasure to invite you to a talk that will take place in
the second part of the CNS/OSS class on Monday, 21st of October 2013,
7-8pm, room EC002, by Alexandru Calotoiu.

The talk is "Using Automated Performance Modeling to Find Scalability
Bugs in Complex Codes".

Alexandru is a master graduate in Simulation Sciences la German Research
School, and is currently a PhD student at Forschungszentrum
Juelich. Aside from this talk, Alexandru will present the Scalasca
(http://www.scalasca.org/) application.

The talk abstract is:
---
Many parallel applications suffer from latent performance limitations
that may prevent them from scaling to larger machine sizes. Often, such
scalability bugs manifest themselves only when an attempt to scale the
code is actually being made - a point where remediation can be
dicult. However, creating analytical performance models that would allow
such issues to be pinpointed earlier is so laborious that application
developers attempt it at most for a few selected kernels, running the
risk of missing harmful bottlenecks. In this paper, we show how both
coverage and speed of this scalability analysis can be substantially
improved. Generating an empirical performance model automatically for
each part of a parallel program, we can easily identify those parts that
will reduce performance at larger core counts. Using a climate
simulation as an example, we demonstrate that scalability bugs are not
conned to those routines usually chosen as kernels.
---

Razvan